"The site is involved in uranium enrichment, they are developing a number of techniques", said Farid Soleimani, senior official of National Council for Resistance in Iran, ahead of a press conference in Vienna.

"Iran has been carrying out nuclear work" at the facility at the site known as Modern Defensive Readiness and Technology Center, Shahin Gobadi, a spokesman for the NCRI, told AFP from Paris.

The UN watchdog International Atomic Energy Agency reported Monday that Iran had pledged to suspend all uranium enrichment activities as of November 22, in time for an IAEA meeting in Vienna November 25 that will decide whether to take the Islamic Republic to the UN Security Council for possible sanctions.

The United States charges that Iran is secretly developing nuclear weapons and wants Tehran to be brought before the Security Council.

The IAEA inspectors should check the facility, the spokesman said.

Two years ago, the the NCRI or People's Mujahedeen, disclosed the existence of a then secret site at Natanz, located 250 kilometres (150 miles) south of Tehran. Natanz has uranium enrichment facilities, which the Iranians said last September started on a trial basis.

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